@media screen and (min-width: 768px) {
    .center {
        width: 100%;
        box-sizing: border-box;
    }

}

@media screen and (min-width: 1056px) {
    .center {
        width: 100%;
        max-width: 1200px;
        margin: 0 auto;
    }
}

@media screen and (max-width: 768px) {
    .center {
        margin: 0 auto;
        padding: 0 20px;
    }

}

@media screen and (max-width: 1056px) {
    .all {
        display: none;
    }
}

.clearfix::after {
    content: '';
    display: block;
    clear: both;
}

* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    width: 100%;
}

.center {
    margin: 0 auto;
}

/**********************头部*********************/
.header {
    position: fixed;
    top: 0;
    height: 50px;
    width: 100%;
    background-color: #303643;
    z-index: 2;
    opacity: 0.85;
}

.header-con {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    align-items: center;
    max-width: 1200px;
    height: 50px;
    margin: 0 auto;
    box-sizing: border-box;
}

.nav {
    display: inline-block;
    height: 50px;
    line-height: 50px;
}

.nav ul li {
    float: left;

    :hover {
        background-color: #53c9c6;
    }
}

.fill li a {
    font-weight: 600;
    display: inline-block;
    position: relative;
    padding: 0 20px;
    color: #fff;
    font-size: 14px;
    transition: background-color ease .3s;
}

.message {
    float: right;
    background-color: gray;
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.message img {

    border-radius: 50%;
}

.loginbtn {
    float: right;
    background: #08979C;
    opacity: 0.9;
    color: white;
    font-size: 14px;
    height: 32px;
    border-radius: 5px;
    line-height: 32px;
    text-align: center;
    -webkit-transition: color 0.3s ease-out 0s;
    transition: color 0.3s ease-out 0s;
    width: 70px;
    margin-left: 10px;
}

.loginbtn:hover {
    color: #fff;
}

.logo {
    font-size: 20px;
}

.header span {
    color: #53c9c6;
    font-size: 30px;
}

.header input {
    margin-right: 50px;
    width: 200px;
    height: 28px;
    text-indent: 1em;
}

/**********************页脚************************************/
.footer {
    background: #333;
    width: 100%;
    min-height: 60px;
    padding: 20px 0;
    color: #8E8E8E;

    .footer-con {
        max-width: 1200px;
        min-height: 60px;
    }
}

.flink {
    color: #CECECE;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;

    a {
        height: 20px;
        color: #CECECE;
        margin-bottom: 20px;
        margin-right: 10px;
    }

    a:hover,
    span:hover {
        color: #35aba8;
    }

    img {
        height: 25px;
        width: 25px;
        position: relative;
    }
}

.copyright {
    color: #CECECE;
    font-family: Arial;
    margin-top: 22px;
    font-size: 12px;
}

.green {
    color: #35aba8;
}